The read-eval-print loop

Play audio slide show -- Keyboard shortcut: 'x'

Lecture overview -- Keyboard shortcut: 'u'

Previous page: Equality in Scheme -- Keyboard shortcut: 'p'

Next page: Types [Section] -- Keyboard shortcut: 'n'

Lecture notes - all slides together

Annotated slide -- Keyboard shortcut: 't'

Textbook -- Keyboard shortcut: 'v'

Alphabetic index

Help page about these notes

Expressions, Types, and Functions - slide 10 : 46

The read-eval-print loop

The 'read-eval-print loop' allows you to interact with a Scheme system in terms of evaluation of individual expressions

1> (+ 4 (* 5 6))
34

2> (define x 6)

3> (+ (* 5 x x) (* 4 x) 3)
207

4> (/ 21 5)
21/5

5> (/ 21.0 5)
4.2

6> (define (fak n) (if (= n 0) 1 (* n (fak (- n 1)))))

7> (fak 50)
30414093201713378043612608166064768844377641568960512000000000000